原标题：Maxim MAX5977A 1V-16V热插拔控制方案

　　Maxim公司的MAX5977A/MAX5977B是1V-16V单电源热插拔控制器,能对系统提供最完整的保护.电流检测放大器输出精度1%,热插拔监视电压1V-16V,并具有电路中断器功能,主要用在通用热插拔,网络交换和路由器,服务器以及存储系统.本文介绍了MAX5977A/MAX5977B主要特性,方框图以及典型应用电路.

　　The MAX5977A/MAX5977B hot-swap controllers provide complete protection for systems with a 1V to 16V single-supply voltage.

　　During the initial insertion, the hot-swap controllers limit the inrush current from damaging the board or from shorting out the backplane. When the input voltage is above the undervoltage threshold and below the overvoltage threshold, a 5µA current source powered from the internal 5V charge pump drives the gate of an external n-channel MOSFET providing a slow turn-on response. An internal current-sense amplifier in the IC monitors the current across an external shunt resistor providing current sensing for wide input-sense voltage range. The devices provide two levels of overcurrent circuit-breaker protections: a fast-trip threshold for a fast turn-off and a lower slow-trip threshold for a delayed turn-off.

　　Exceeding either of the overcurrent circuit-breaker thresholds will force the device into fault mode where the external n-channel MOSFET is disabled. The MAX5977 is available in two versions which provide a latched off (MAX5977A) or autoretry (MAX5977B) output when the device is in fault mode.

　　A calibration mode allows further calibration of the integrated transconductance amplifier for production testing of the final design. The devices are offered in a 20-pin, 4mm x 4mm, TQFN-EP package and are fully specified from -40℃ to +85℃

　　MAX5977A/MAX5977B主要特性:

　　1% Accurate Current-Sense Amplifier Output

　　Hot-Swap Monitors Operation from 1V to 16V

　　Integrated Charge Pump Fully Enhances the

　　External n-Channel FET (VGATE = VIN + 5V)

　　VariableSpeed/BiLevel™ Fault Protection Provides

　　Electronic Circuit-Breaker Function

　　Output Latched Off After Fault Condition (MAX5977A)

　　Autoretry After Fault Condition (MAX5977B)

　　Power-Good Indicator

　　Calibration Mode

　　Small, 20-Pin, 4mm x 4mm, TQFN-EP Package

　　MAX5977A/MAX5977B应用:

　　General Hot-Swap

　　Network Switches and Routers

　　Servers

　　Storage Systems

　　图1.MAX5977A/MAX5977B方框图

　　图2.MAX5977A/MAX5977B典型应用框图

　　图3.MAX5977A/MAX5977B应用电路图